Method for improving corner cracks and middle cracks of plate blank
A technology for corner cracks and slabs is applied in the field of improving the corner cracks and intermediate cracks of slabs based on dual-temperature process control at the corners of the slab, and can solve the increase of bending straightening reaction force. , reduce production efficiency, reduce equipment service life and other problems, to achieve the effect of improving intermediate crack control, optimizing positioning parameters, and improving stress conditions
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Embodiment 1
[0077] A medium-high carbon steel billet is prepared by a continuous casting machine, and the composition of the medium-high carbon steel is:
[0078] steel type C(2) Si(2) Mn(2) P(3) S(3) Al S (3)
Medium and high carbon steel (wt%) ≤0.48 ≤0.30 0.50~1.30 ≤0.020 ≤0.010 ≤0.020
[0079] The setting of the continuous casting machine is: the gap between the trunnion on the east side of the bending section and the "U"-shaped seat is measured with a feeler gauge to be 0.2mm, and the gap between the trunnion on the west side and the "U"-shaped seat is measured to be 0.3mm with a feeler gauge;
[0080] Casting speed during pouring is 1.1m / min~1.4m / min, tundish temperature is 1535℃~1545℃;
[0081] Set the target temperature at the corner of the billet in the bending area to 910°C, and use an infrared temperature measuring gun to measure the actual temperature at 900°C to 908°C; set the target temperature at the corner of the billet in the straightening...
Embodiment 2
[0090] A continuous casting machine is used to prepare a boron-containing steel billet, and the composition of the boron-containing steel is:
[0091] steel type C(2) Si(2) Mn(2) P(3) S(3) Al S (3)
B(4) Boron-containing steel (wt%) ≤0.20 ≤0.30 0.30~0.90 ≤0.020 ≤0.010 ≤0.025 ≤0.0020
[0092] The setting of the continuous casting machine is: the gap between the trunnion on the east side of the bending section and the "U"-shaped seat is measured with a feeler gauge to be 0.5mm, and the gap between the trunnion on the west side and the "U"-shaped seat is measured to be 0.6mm with a feeler gauge;
[0093] Casting speed during pouring is 1.1m / min~1.6m / min, tundish temperature is 1545℃~1555℃;
[0094] Set the target temperature at the corner of the billet in the bending area to 900°C, and use an infrared temperature measuring gun to measure the actual temperature at 902°C to 915°C; set the target temperature at the corner of the billet in the stra...
Embodiment 3
[0103]A continuous casting machine is used to prepare microalloyed steel slabs, and the composition of the microalloyed steel is:
[0104]
[0105] The setting of the continuous casting machine is: the gap between the trunnion on the east side of the bending section and the "U"-shaped seat is measured with a feeler gauge to be 0.3mm, and the gap between the trunnion on the west side and the "U"-shaped seat is measured to be 0.35mm with a feeler gauge;
[0106] Casting speed during pouring is 1.0m / min~1.3m / min, tundish temperature is 1540℃~1550℃;
[0107] Set the target temperature at the corner of the billet in the bending area to 920°C, and use an infrared temperature measuring gun to measure the actual temperature at 925°C to 930°C; set the target temperature at the corner of the billet in the straightening area to 700°C, and use an infrared temperature measuring gun to measure the temperature at the entrance of the straightening area. The corner temperature of the slab i...
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